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`test_std_on_unsupported_target` never really succeed to build those targets, due to * local rustup may not have `{aarch64,x86_64}-unknown-none` installed. * `core` and `compiler-builtins` mock crate are not `no_std` nor `no_core` * the dummy `main.rs` uses `println!` and is not `no_std`. This commit make it compile, if you have those targets installed.